Western culture is a kaleidoscope of cultural and religious diversity. We’re not just talking about Christian vs. Atheist or Religious vs. Secular, but we’re talking about Christians, Secularists, Evangelicals, Baptists, Atheists, Muslims, Jews, Naturalists, Pagans, Adventists, Protestants, etc… you get my drift.
In my opinion, religious groups falsely demonize “secularity” because they believe it has an agenda which is equal to their own. 
I.e. The Christian agenda is equal to the Muslim agenda is equal to the Secular agenda.